Research On Uplink Scheduling Of LTE System

LTE is the "quasi-4G" technology based on the 10 years'research of beyond 3G (B3G) technologies developed by the 3GPP in order to combat such as mobile WiMAX broadband wireless access technology and market challenges in the trend of mobile communication evolution to broadband. The air interface in LTE system uses orthogonal frequency division multiple access (OFDM/FDMA) replaced the 3GPP long-term use of Code Division Multiple Access (CDMA) as a multiple access technology and uses a lot of multiple-input and multiple-output (MIMO) technology, and adaptive technology to get higher data rates and system performance.At present, how to manage and utilize scarce radio resource has become one of the most concerned issues, with the growth of mobile and internet users and the increasing of demand of QoS guarantee. Radio Resource Management(RRM), which has been brought forward as a key technology, is an important performance index to weigh the feasibility of a standard and whether it can be accepted by operators or not. when multi-users apply services at the same time in the condition of inadequate radio resource, we must establish reasonable rules and algorithms to satisfy the QoS requirements for different users, which means we must order the users and assign services duration for each user, so wireless scheduling algorithms, which manage radio resource for data traffic, is an important component of RRM.Based on the study and research of RRM, this paper aim to find scheduling algorithms applied on the uplink in LTE system with result to achieve better balance between throughput and fairness.In chapter 1, the architecture and the value of this dissertation are introduced. In chapter 2, introduces the LTE system, including system construct, physical layer and wireless interface protocol. In chapter 3, LTE dynamic simulation platform is introduced in detail, including the simulation of the main flow and the various functional modules and the design realization process. In chapter 4, the key technologies of LTE uplink are introduced, such as SRS, power control, HARQ, AMC and the process of uplink scheduling. In chapter 5, the process of LTE uplink scheduling is introduced. In chapter 6, some scheduling algorithms are discussed and their performances are compared. Chapter 7 is the final chapter of the full paper, which sums up the whole research work and proposes next phase of the research.